With later Xonar drivers (the ones with "bit perfect" Asio), the volume control is disabled when using Asio.
This is a showstopper for me, I run analogue out to an active crossover then power amps. The PC is the volume control.
There is such a thing as too 'bit perfect"
Also, I see no evidence in the Xonar control panel that it is changing sample rates. The sample rate menu box is not changing automagically when using Xonar Asio.
I'll have to stick with Wasapi Event Style and change the sample rate manually.